Eric Wise has put together a overview of object oriented programming (OOP) concepts for VB.NET.  Please read if you're new to .NET or not sure you understand what OOP is.  Anything you can do to improve your OOP knowledge and skills will have a direct impact on your effectiveness and enjoyment of .NET (or any OOP language, for that matter).

If you prefer C#, use a VB.NET/C# syntax comparison to help you translate Eric's VB.NET code examples and list of declaration options.